Alert archive / South Dakota / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 61, NWS Sioux Falls, SD

July 10, 1987Bon Homme County, Charles Mix County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 10, 1987, 6:51 AM CDT for Bon Homme County, Charles Mix County, South Dakota. It was in force for 54 min.

The area

The counties it named.

The facts

Issued: Jul 10, 1987, 6:51 AM CDT (11:51 UTC)
Expired: Jul 10, 1987, 7:45 AM CDT
In force: 54 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties

Counties Bon Homme County, SD, Charles Mix County, SD

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Aberdeen, SD (KHON), launched 00:00Z, 11.9 hours before the alert went out and 201 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 3310 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 328 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 21.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 10, 3:33 AM CDT, 3 hours 18 minutes before

^DSMSPSSUX
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
330 AM CDT FRI JUL 10 1987

...FLASH FLOOD WATCH REST OF TONIGHT...
...SEVERE THUNDERSTORM WATCH UNTIL 5 AM FRIDAY MORNING...

AT 325 AM CDT RADAR SHOWED A LINE OF VERY STRONG THUNDERSTORMS
WAS MOVING ACROSS DIXON...DAKOTA AND THURSTON COUNTIES IN NORTHEAST
NEBRASKA AND MONONA COUNTY IN WESTERN IOWA.  THE STORMS WERE MOVING
EAST AT 25 MILES AN HOUR.

THESE THUNDERSTORMS HAVE THE POTENTIAL FOR DANGEROUS LIGHTNING...HEAVY
SHOWERS...STRONG GUSTY WINDS AND SMALL HAIL.  RESIDENTS OF DIXON...
DAKOTA...THURSTON AND MONONA COUNTIES SHOULD BE ON THE LOOKOUT FOR ANY
SEVERE WEATHER AND TAKE SHELTER IMMEDIATELY IF IT IS OBSSERVED.
SHERLIN

Special weather statement, Jul 10, 3:44 AM CDT, 3 hours 7 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
335 AM CDT FRI JUL 10 1987

AT 330 AM CDT...NUMEROUS INTENSE THUNDERSTORMS CONTINUED OVER PARTS OF
EXTREME NORTHEAST NEBRASKA WHILE NUMEROUS HEAVY THUNDERSTORMS CONTINUED
OVER PARTS OF NORTHWEST IOWA.

THE INTENSE STORMS WERE JUST SOUTH OF THE SOUTH DAKOTA-NEBRASKA BORDER
WITH THE HEAVIEST STORMS LOCATED ON A LINE FROM 25 MILES SOUTH OF
YANKTON TO 30 MILES SOUTHEAST OF PICKSTOWN.

THESE STORMS ARE CAPABLE OF PRODUCING HAIL...STRONG GUSTY WINDS...VERY
HEAVY RAIN AND DANGEROUS LIGHTNING.  PERSONS IN THE LEWIS AND CLARK
LAKE AREA SHOULD REMAIN ALERT FOR THREATENING WEATHER CONDITIONS AS
THESE STORMS PAS.S JUST TO THE SOUTH.

MOVEMENT WAS EAST AT 25 MILES AN HOUR.
PFEIFFER

Special weather statement, Jul 10, 4:48 AM CDT, 2 hours 3 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HURON SD
435 AM CDT FRI JUL 10 1987

AT 430 AM CDT...SCATTERED INTENSE THUNDERSTORMS CONTINUED OVER PARTS OF
EXTREME SOUTHEAST SOUTH DAKOTA...NORTHEAST NEBRASKA AND INTO NORTHWEST
IOWA.

THESE STORMS WERE MOSTLY SOUTH OF THE SOUTH DAKOTA-NEBRASKA BORDER
WITH THE HEAVIEST STORMS LOCATED 10 MILES EAST AND 10 MILES SOUTHWEST
OF ELK POINT...ON LINE FROM 15 MILES SOUTH OF VERMILLION TO 30 MILES
SOUTHWEST OF YANKTON AND 30 MILES SOUTH OF PICKSTOWN.

THESE STORMS ARE CAPABLE OF PRODUCING HAIL...STRONG GUSTY WINDS...VERY
HEAVY RAIN AND DANGEROUS LIGHTNING.  PERSONS IN EXTREME SOUTHEAST SOUTH
DAKOTA SHOULD REMAIN ALER@T FOR THREATENING WEATHER CONDITIONS.

MOVEMENT WAS EAST AT 25 MILES AN HOUR.
PFEIFFER

Special weather statement, Jul 10, 4:52 AM CDT, 1 hour 59 minutes before

^DSMSPSSUX
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
450 AM CDT FRI JUL 10 1987

...SEVERE THUNDERSTORM WATCH FOR SIOUXLAND AREA HAS BEEN CANCELLED...

AT 445 AM CDT RADAR SHOWED AN AREA OF VERY STRONG THUNDERSTORMS
MOVING INTO DIXON COUNTY NEBRASKA AND UNION COUNTY SOUTH DAKOTA.  THE
CLOSEST THUNDERSTORM TO SIOUX CITY...IN THIS AREA. IS ABOUT 20 MILES
TO THE NORTHEAST.

A SECOND AREA OF VERY STRONG THUNDERSTORMS IS MOVING ACROSS EASTERN
THURSTON COUNTY...ABOUT 18 MILES SOUTHWEST OF SIOUX CITY...AND ALL
OF MONONA COUNTY IOWA.

BOTH OF THESE AREAS WERE MOVING EAST AT ABOUT 30 MILES AN HOUR AND
PRODUCING DANGEROUS LIGHTNING...BRIEF HEAVY SHOWERS AND STRONG WIND
GUSTS.  STRONG THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS THE SIOUXLAND
AREA UNTIL ABOUT 700 AM CDT.
SHERLIN

Special weather statement, Jul 10, 5:17 AM CDT, 1 hour 34 minutes before

^DSMSPSSUX
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX CITY IA
515 AM CDT FRI JUL 10 1987

...CONTINUOUS LIGHTNING ACROSS SIOUXLAND THIS MORNING...

BETWEEN 515 AND 600 AM CDT...AN AREA OF VERY STRONG THUNDERSTORMS
WILL MOVE ACROSS THE SIOUX CITY METROPOLITAN AREA.  THESE THUNDERSTORMS
WILL PRODUCE NEAR CONTINUOUS LIGHTNING...BRIEF HEAVY SHOWERS AND STRONG
WIND GUSTS.  THE THUNDERSTORMS WERE MOVING SOUTHEAST AT AROUND 30
MILES AN HOUR.

RESIDENTS OF SIOUX CITY...AND THE SURROUNDING AREA...WHO LIVE IN LOW
LYING AREAS SHOULD WATCH OUT FOR THE HEAVY SHOWERS AS THEY COULD
QUICKLY FLOOD SOME LOW LYING AREAS.

SHERLIN

Special weather statement, Jul 10, 6:27 AM CDT, 24 minutes before

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The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 9, 7:36 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Brule, Charles Mix	54 min
Jul 9, 7:36 PM CDT	Severe Thunderstorm Warning	FSD	Gregory	54 min
Jul 9, 8:07 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Douglas	53 min
Jul 9, 9:39 PM CDT	Tornado Warning	FSD	Hutchinson, Turner	36 min
Jul 9, 9:47 PM CDT	Severe Thunderstorm Warning	FSD	Turner	43 min
Jul 9, 10:16 PM CDT	Severe Thunderstorm Warning	FSD	Brookings	59 min
Jul 9, 10:23 PM CDT	Severe Thunderstorm Warning	FSD	Turner	27 min
Jul 9, 10:23 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Lincoln	52 min
Jul 10, 12:00 AM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	60 min
Jul 10, 2:06 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Charles Mix	54 min
Jul 10, 3:56 PM CDT	Severe Thunderstorm Warning	FSD	Mellette	64 min
Jul 10, 4:05 PM CDT	Tornado Warning	FSD	Mellette	25 min
Jul 10, 4:28 PM CDT	Tornado Warning	FSD	Mellette	32 min
Jul 10, 4:38 PM CDT	Severe Thunderstorm Warning	FSD	Todd	67 min
Jul 10, 4:59 PM CDT	Severe Thunderstorm Warning	FSD	Mellette	61 min
Jul 10, 5:42 PM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	63 min
Jul 10, 6:42 PM CDT	Severe Thunderstorm Warning	FSD	Todd, Tripp	63 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 1987 Every severe thunderstorm warning in 1987

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.